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Wed, 6 Jan 2021 18:53:12 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 35w3qscvkn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 06 Jan 2021 18:53:12 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 106Iqnt3017026; Wed, 6 Jan 2021 18:52:49 GMT Received: from localhost.localdomain (/209.6.208.110) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 06 Jan 2021 18:52:48 +0000 Date: Wed, 6 Jan 2021 13:52:41 -0500 From: Konrad Rzeszutek Wilk To: Claire Chang Subject: Re: [RFC PATCH v3 2/6] swiotlb: Add restricted DMA pool Message-ID: <20210106185241.GA109735@localhost.localdomain> References: <20210106034124.30560-1-tientzu@chromium.org> <20210106034124.30560-3-tientzu@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210106034124.30560-3-tientzu@chromium.org> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9856 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 mlxscore=0 spamscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101060106 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9856 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 bulkscore=0 spamscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 mlxscore=0 malwarescore=0 clxscore=1011 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101060105 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: heikki.krogerus@linux.intel.com, peterz@infradead.org, grant.likely@arm.com, paulus@samba.org, frowand.list@gmail.com, mingo@kernel.org, m.szyprowski@samsung.com, sstabellini@kernel.org, saravanak@google.com, joro@8bytes.org, rafael.j.wysocki@intel.com, hch@lst.de, bgolaszewski@baylibre.com, xen-devel@lists.xenproject.org, treding@nvidia.com, devicetree@vger.kernel.org, will@kernel.org, dan.j.williams@intel.com, linuxppc-dev@lists.ozlabs.org, robh+dt@kernel.org, boris.ostrovsky@oracle.com, andriy.shevchenko@linux.intel.com, jgross@suse.com, drinkcat@chromium.org, gregkh@linuxfoundation.org, rdunlap@infradead.org, linux-kernel@vger.kernel.org, tfiga@chromium.org, iommu@lists.linux-foundation.org, xypron.glpk@gmx.de, robin.murphy@arm.com, bauerman@linux.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hello! In this file: > diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c > index e4368159f88a..7fb2ac087d23 100644 > --- a/kernel/dma/swiotlb.c > +++ b/kernel/dma/swiotlb.c .. > +static const struct reserved_mem_ops rmem_swiotlb_ops = { > + .device_init = rmem_swiotlb_device_init, > + .device_release = rmem_swiotlb_device_release, > +}; > + > +static int __init rmem_swiotlb_setup(struct reserved_mem *rmem) > +{ > + unsigned long node = rmem->fdt_node; > + > + if (of_get_flat_dt_prop(node, "reusable", NULL) || > + of_get_flat_dt_prop(node, "linux,cma-default", NULL) || > + of_get_flat_dt_prop(node, "linux,dma-default", NULL) || > + of_get_flat_dt_prop(node, "no-map", NULL)) > + return -EINVAL; > + > + rmem->ops = &rmem_swiotlb_ops; > + pr_info("Reserved memory: created device swiotlb memory pool at %pa, size %ld MiB\n", > + &rmem->base, (unsigned long)rmem->size / SZ_1M); > + return 0; > +} > + > +RESERVEDMEM_OF_DECLARE(dma, "restricted-dma-pool", rmem_swiotlb_setup); The code should be as much as possible arch-agnostic. That is why there are multiple -swiotlb files scattered in arch directories that own the architecture specific code. Would it be possible to move the code there and perhaps have a ARM specific front-end for this DMA restricted pool there? See for example the xen-swiotlb code. Cheers! Konrad